Re: Need jumper settings on Teac FD-55BV drive


"Old-Timer" <jdgill@xxxxxxxx> wrote in message
news:1139880809.109880.206700@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
The Teac FD-55BV-06-U is a 360K 40 track MFM drive. I'm trying to connect
one
to my S-100 bus system. I have already connected a FD-55GFR 149-US
drive as 77 Tracks, 15 512-byte sectors per track. I left the DC signal
connected
to pin-34 (it is not used) and connected a jumper between the Ready
jumper pin
and pin-6 (DS3) of the cable. Pin-6 of the 34-pin cable is connected to
pin-22
(/Ready) of the 50-pin connector to my CompuPro Disk-1 FDC.

I have a FD55BV-11-U in my hand. The circuit board is different from the
FD55B. The 55BV seems to be close to the 55BR described on the Teac web
site.

I noticed the 360K drive has a Ready line, but it goes HIGH when the drive
is
ready and low when the door is open. The reverse of what I need. I suspose
I could put an inverter chip (7406) on the board to reverse the logic.
But I would rather tap it off at some point that has the correct polarity.

How do you have the Ready "RY" jumper set? You might try to reverse it. If
memory serves, the "RY" jumper has to be on in older computers, but acts as
a media change function for the IBM PC.

I also noticed that there is a 14 pin socket on the 360K board. For a
terminator
resistor ??? There is also a SIP pull-up resistor near the 34 pin
connector like
on the 55GFR, but the 55GFR does not have a terminator resistor socket.
Does anyone know what type of terminator resistor IC is used ????

The resistor pack is labeled IAM E3317. It is a 330-ohm terminating
resistor pack. Generally, the last drive on the floppy chain is terminated.

I would like to connect the 360K drive to my S-100 system so that I can
transfer data back and forth with a Morrow MD-16 system which uses a
360K drive as 40 track, 5 1024 bytes sectors per track.

Does anyone have any spec sheets or schematic on the 55BV drive ?
I could not find any on the web, even at Teac's site.

Thanks.....
Old-Timer (John) jdgill at juno dot com

Hope this helps.

Larry


.

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